Inductor circuit and wireless communication device having inductor circuit integrated on single chip die to save more circuit costs

ABSTRACT

An inductor circuit includes a receiver inductive circuit, a transmitter inductive circuit, and an antenna inductive circuit which are implemented on a single chip die; the receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane; and, a circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.

CROSS REFERENCE TO RELATED APPLICATIONS

This application is a continuation-in-part of U.S. application Ser. No. 17/584,392, filed on Jan. 26, 2022. The content of the application is incorporated herein by reference.

BACKGROUND OF THE INVENTION 1. Field of the Invention

The invention relates to a transformer structure, and more particularly to an inductor circuit and a wireless communication device.

2. Description of the Prior Art

Generally speaking, for a conventional wireless transceiver, it is needed to use multiple circuit areas such as different chip dies to individually implement the different coils of a conventional transformer circuit of the conventional wireless transceiver. This indicates that more circuit areas are necessary for an implementation of the conventional transformer circuit.

SUMMARY OF THE INVENTION

Therefore one of the objectives of the invention is to provide an inductor circuit and a wireless communication device having the inductor circuit, to solve the above-mentioned problems.

According to embodiments of the invention, an inductor circuit is disclosed. The inductor circuit comprises a receiver inductive circuit, a transmitter inductive circuit, and an antenna inductive circuit. The receiver inductive circuit has a first end coupled to a first input port of a receiver circuit and a second end coupled to a second input port of the receiver circuit. The transmitter inductive circuit has a first end coupled to a first output port of a transmitter circuit and a second end coupled to a second output port of the transmitter circuit. The antenna inductive circuit has a first end coupled to a first signal port of an antenna circuit and a second end coupled to a second signal port of the antenna circuit. The receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane; and, a circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.

According to the embodiments, a wireless communication device is further disclosed. The wireless communication device comprises the above-mentioned inductor circuit, an antenna circuit, a receiver circuit, and a transmitter circuit.

According to the embodiments, an inductor circuit is further disclosed. The inductor circuit comprises a receiver inductive circuit, a transmitter inductive circuit, and an antenna inductive circuit. The transmitter inductive circuit is respectively coupled to and used by a transmitter circuit and a receiver circuit during different time periods. The antenna inductive circuit has a first end coupled to a first signal port of an antenna circuit and a second end coupled to a second signal port of the antenna circuit. The receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane. A circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.

According to the embodiments, a wireless communication device is further disclosed. The wireless communication device comprises a receiver circuit, a transmitter circuit, and an inductor circuit. The inductor circuit comprises a receiver inductive circuit, a transmitter inductive circuit, and an antenna inductive circuit. The transmitter inductive circuit is respectively coupled to and used by the transmitter circuit and the receiver circuit during different time periods. The antenna inductive circuit has a first end coupled to a first signal port of an antenna circuit and a second end coupled to a second signal port of the antenna circuit. The receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane. A circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.

According to the embodiments, the better circuit balancing and better circuit/signal matching can be provided, and more circuit areas can be saved.

These and other objectives of the present invention will no doubt become obvious to those of ordinary skill in the art after reading the following detailed description of the preferred embodiment that is illustrated in the various figures and drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram of a wireless communication device according to an embodiment of the invention.

FIG. 2 is a diagram of a physical circuit layout example showing the receiver inductive circuit LR according to an embodiment of the invention.

FIG. 3 is a diagram of a physical circuit layout example showing the antenna inductive circuit LA according to an embodiment of the invention.

FIG. 4 is a diagram of a physical circuit layout example showing the transmitter inductive circuit LT according to an embodiment of the invention.

FIG. 5 is a diagram of a physical circuit layout example showing a combination displacement of the antenna, receiver, and transmitter inductive circuits LA, LR, and LT of the inductor circuit in FIG. 1 according to an embodiment of the invention.

FIG. 6 is a diagram of a wireless communication device according to another embodiment of the invention.

FIG. 7 is a diagram of an example of the inductor circuit when being applied into a structure of a Gm-boosted common gate low noise amplifier (CG LNA) at the receiver circuit of FIG. 6 according to an embodiment of the invention.

FIG. 8 is a diagram of an example of the inductor circuit when being applied into a structure of a source inductive-degenerated low noise amplifier (LNA) at the receiver circuit of FIG. 6 according to an embodiment of the invention.

FIG. 9 is a diagram of a wireless communication device according to another embodiment of the invention.

FIG. 10 is a diagram of an example of the inductor circuit when being applied into a structure of multi-power selection power amplifiers in the transmitter circuit of FIG. 9 according to an embodiment of the invention.

FIG. 11 is a diagram of an example of the inductor circuit when being applied into a structure of Doherty power amplifier scheme in the transmitter circuit of FIG. 9 according to an embodiment of the invention.

DETAILED DESCRIPTION

The invention aims at providing a technical solution of a wireless communication device and a corresponding transformer inductor circuit in which its larger portion or all inductive components are disposed on and/or inside a ring of a specific plane, so as to effectively save circuit costs and reduce the circuit areas occupied by the inductive components. The provided technical solution can more effectively reduce the circuit area occupied by the inductive components for a single chip die. Compared to a conventional method which individually implements the different inductive components, the provided technical solution can efficiently integrate a larger portion or all inductive components into the same circuit area on the same plane to save more circuit costs.

FIG. 1 is a block diagram of a wireless communication device 100 according to an embodiment of the invention. The wireless communication device 100 comprises an antenna circuit 105, a receiver circuit 110, a transmitter circuit 115, and an inductor circuit 120 which is a transformer circuit. The wireless communication device 100 for example is implemented by a system-on-chip (SOC) circuit component such as a single chip die. The wireless communication device 100 for example supports at least one kind of wireless communication protocols such as mobile communication protocol(s), Bluetooth communication protocol, and any versions of IEEE 802.11 communication protocols (i.e. Wireless LAN protocol). For instance, the wireless communication device 100 may be a Bluetooth transceiver or a Wi-Fi transceiver. The wireless communication device 100 for example is a transceiver device which can be operative in a signal reception mode and a signal transmission mode respectively.

The transmitter circuit 115 for example in the signal transmission mode is arranged to generate and output a set of differential signals to the inductor circuit 120. The receiver circuit 110 in the signal reception mode is arranged to receive another set or pair of differential signals.

The inductor circuit 120 used as a transformer comprises a first inductive circuit LR, a second inductive circuit LT, and a third inductive circuit LA, wherein the inductive circuits LR, LT, and LA are respectively arranged and disposed for the receiver side, the transmitter side, and the antenna side, and are respectively called the receiver inductive circuit LR, transmitter inductive circuit LT, and the antenna inductive circuit LA in the following paragraphs. The antenna inductive circuit LA is disposed or located at a primary side of the transformer 120, and the receiver inductive circuit LR and transmitter inductive circuit LT are disposed or located at a secondary side of the transformer 120. The signal polarities are shown in FIG. 1 .

The antenna inductive circuit LA is an inductive wire coil at the antenna side which has a first end LA_E1 coupled to a first signal port P1 of the antenna circuit 105 and has a second end LA_E2 coupled to a second signal port P2 of the antenna circuit 105. The first signal port P1 and second signal port P2 for example are differential signal ports used for transferring a pair of differential signals from the antenna circuit 105 to the transformer 120 in the signal reception mode and used for transferring another pair of differential signals from the transformer 120 to the antenna circuit 105 in the signal transmission mode. In the signal reception mode, the pair of differential signals are passed through the antenna inductive circuit LA and receiver inductive circuit LR through a transformer coupling operation and then received by the receiver circuit 110. In the signal transmission mode, the different pair of differential signals are passed through the transmitter inductive circuit LT and antenna inductive circuit LA through another transformer coupling operation and then received by the antenna circuit 105 to transmit the differential signals into the air.

Alternatively, in other embodiment, one of the first signal port P and second signal port P2 may be associated with an operation for transmitting and receiving a communication signal and the other port is associated with a ground level of the antenna circuit 105. This is not intended to be a limitation.

The receiver inductive circuit LR is an inductive wire coil at the reception side which has a first end LR_E1 coupled to a first input port R1 of the receiver circuit 110 and a second end LR_E2 coupled to a second input port R2 of the receiver circuit 110. The first input port R1 and second input port R2 are differential input ports of the receiver circuit 110. In addition, a center terminal/end LR_C of the wire coil of the receiver inductive circuit LR is coupled to the ground node P4 of the receiver circuit 110.

The transmitter inductive circuit LT is an inductive wire coil at the transmission side which has a first end LT_E1 coupled to a first output port S1 of the transmitter circuit 115 and a second end LT_E2 coupled to a second output port S2 of the transmitter circuit 115. The first output port S1 and second output port S2 are differential output ports of the transmitter circuit 115. In addition, the transmitter inductive circuit LT further comprises a first intermediate terminal LT_E3 coupled to a third output port S3 of the transmitter circuit 115 and a second intermediate terminal LT_E4 coupled to a fourth output port S4 of the transmitter circuit 115. The first output port S1 and the second output port S2 of the transmitter circuit 115 correspond to a first transmission power of the signal transmission mode, and the third output port S3 and the fourth output port S4 of the transmitter circuit 115 correspond to the signal transmission mode's a second transmission power which is different from the first transmission power. In addition, a center terminal/end LT_C of the wire coil of the transmitter inductive circuit LT is coupled to the ground node P3 of the transmitter circuit 115.

The turns ratios (or the numbers of turns) are respectively shown on FIG. 1 . The number of turns for the antenna inductive circuit LA is N1, the number of turns for the receiver inductive circuit LR is N2, and the number of turns for the transmitter inductive circuit LT at different points is equal to N3 or N4. For instance, the receiver inductive circuit's LR wire coil from the first end LR_E1 to the second end LR_E2 is configured to have the number of turns equal to N2, and the antenna inductive circuit's LA wire coil from the first end LA_E1 to the second end LA_E2 is configured to have the number of turns equal to N1. The transmitter inductive circuit's LT wire coil from the first end LT_E1 to the second end LT_E2 is configured to have the number of turns equal to N3, and the transmitter inductive circuit's LT wire coil from the first intermediate terminal LT_E3 to the second intermediate terminal LT_E4 is configured to have the number of turns equal to N4. In an example (but not limited), the values of N1, N2, N3, and N4 are equal to 2, 1, 6, and 4. Further, the values of turns ratios of N1, N2, N3, and N4 may be identical or may be equal to different values in other embodiments. These examples are not intended to be the limitations of the invention.

To save more chip die areas as well as achieve the above-mentioned designs of inductive circuits, the above-mentioned inductive circuits LA, LR, and LT can be arranged to be positioned on a single circuit chip die to form the inductor circuit 120. Refer to FIGS. 2-4 in conjunction with FIG. 5 . FIG. 2 is a diagram of a physical circuit layout example showing the receiver inductive circuit LR according to an embodiment of the invention. FIG. 3 is a diagram of a physical circuit layout example showing the antenna inductive circuit LA according to an embodiment of the invention. FIG. 4 is a diagram of a physical circuit layout example showing the transmitter inductive circuit LT according to an embodiment of the invention. FIG. 5 is a diagram of a physical circuit layout example showing a combination displacement of the antenna, receiver, and transmitter inductive circuits LA, LR, and LT of the inductor circuit 120 in FIG. 1 according to an embodiment of the invention. The combination displacement of the antenna, receiver, and transmitter inductive circuits LA, LR, and LT of the inductor circuit 120 are disposed on the same plane such as a specific plane.

In FIG. 2 , in practice, the receiver inductive circuit LR is for example (but not limited) implemented and arranged as a single circle/circular wire without cross-connection portion(s) if the number of turns N2 is configured as one, and single circle wire can be regarded as an outer ring of the inductor circuit 120 and is disposed on a specific ring of the specific plane to form a ring/circle shape as shown in FIG. 2 . The center terminal/node LR_C of the single wire is coupled to the ground node P4 of the receiver circuit 110, and the first end LR_E1 and second end LR_E2 of receiver inductive circuit LR are respectively coupled to the input ports R1 and R2 of the receiver circuit 110. Further, the center terminal/node LR_C of the single circular wire may be coupled to other different circuits which are located at different angles/positions on the specific plane.

In FIG. 3 , the antenna inductive circuit LA is for example implemented and arranged as two circles, i.e. an inner circle (or inner antenna wire) 301 and an outer circle (or outer antenna wire) 302 with one cross-connection portion 303 wherein each circle 301 and 302 is associated with one circular wire if the number of turns N1 is configured as two. The inner circle 301 and outer circle 302 both are to be configured and located inside the outer ring of the inductor circuit 120, i.e. surrounded by the receiver inductive circuit LR. The antenna inductive circuit LA equivalently is arranged as a spiral shape.

In FIG. 4 , the transmitter inductive circuit LT is for example implemented and arranged as three circles, i.e. an inner circle 401, an intermediate circle 402, and an outer circle 403 with multiple cross-connection portions 404 such as five cross-section portions, wherein each circle is associated with two circular wires (i.e. an inner wire and an outer wire) if the number of turns N3 and the number of turns N4 is configured as six and four respectively. The distance between two different adjacent circles is larger than the distance between two adjacent circular wires belonging to the same circle, as shown in FIG. 4 . That is, each inner/intermediate/outer circle 401-403 of the transmitter inductive circuit LT includes two wires, so that the total length from the first end LT_E1 of transmitter inductive circuit LT to the second end LT_E2 of transmitter inductive circuit LT is configured to have six circular wires, and comparatively the total length from the first end LA_E1 of antenna inductive circuit LA to the second end LA_E2 of antenna inductive circuit LA is configured to have two circular wires. This achieves that the turns ratio N1:N3 of the transformer (i.e. the inductor circuit 120) is equal to 2:6. Similarly, the total length from the first intermediate terminal LT_E3 of transmitter inductive circuit LT to the second intermediate terminal LT_E4 of transmitter inductive circuit LT is configured to have four circular wires, and this achieves that the turns ratio N1:N4 of the transformer (i.e. the inductor circuit 120) is equal to 2:4. Similarly, the inner circle 401, intermediate circle 402, and outer circle 403 all are to be configured and located inside the outer ring of the inductor circuit 120, i.e. surrounded by the receiver inductive circuit LR. The transmitter inductive circuit LT equivalently is arranged as a spiral shape.

In FIG. 5 , the inner circle 301 of the antenna inductive circuit LA is disposed between the inner circle 401 and intermediate circle 402 of the transmitter inductive circuit LT so as to separate the inner circle 401 and intermediate circle 402 of the transmitter inductive circuit LT. In addition, the outer circle 302 of the antenna inductive circuit LA is disposed between the outer circle 403 and intermediate circle 402 of the transmitter inductive circuit LT so as to separate the outer circle 403 and intermediate circle 402 of the transmitter inductive circuit LT. It is easy to implement the circuit displacement/arrangement of FIG. 5 on the single circuit die. The transmitter inductive circuit's LT inner circle 401 is equivalently surrounded by the antenna inductive circuit's LA inner circle 301 which is equivalently surrounded by the transmitter inductive circuit's LT intermediate circle 402 which is equivalently surrounded by the antenna inductive circuit's LA outer circle 302 which is equivalently surrounded by the transmitter inductive circuit's LT outer circle 403 which is equivalently surrounded by the receiver inductive circuit's LR circle wire. As shown in FIG. 5 , the transmitter inductive circuit LT and the antenna inductive circuit LA can be regarded to be disposed on an inner ring shape area of the specific plane, which is surrounded by the outer ring of the inductor circuit 120. In addition, the circuit area, occupied by the transmitter inductive circuit LT, on the specific plane is larger than a circuit area occupied by the receiver inductive circuit LR and by the antenna inductive circuit LA.

Further, in FIG. 5 , the antenna inductive circuit LA comprises two antenna circles/wires, and the transmitter inductive circuit LT comprises three transmitter rings/circles each comprising two circular wires; each antenna circle/wire is disposed between two transmitter rings/circles. In other embodiments, the antenna inductive circuit LA may comprise N antenna circles/wires, and the transmitter inductive circuit LT may comprise (N+1) transmitter rings/circles each comprising M circular wires. The value N can be equal to or larger than three so as to achieve the different designs of different turns ratios N1:N2, N1:N3, and N1:N4. The value M can be different from two. These modifications also fall within the scope of the invention.

In other embodiment, different inner/intermediate/outer circles 401-403 of the transmitter inductive circuit LT may respectively have different numbers of circular wires in response to the different designs of the ratios N1:N2, N1:N3, and N1:N4. Further, it should be noted that the shape of the above-mentioned at least one ring/circle/wire can be octagon/polygon/circular. The shape is not intended to be a limitation of the invention.

Further, in FIG. 5 , the first end LR_E1 and the second end LR_E2 of the receiver inductive circuit LR and the ends LT_E1, LT_E2, LT_E3, and LT_E4 of the transmitter inductive circuit LT can be configured and are located as a first side of a single chip die of the inductor circuit 120, i.e. the bottom side in FIG. 5 . The first end LA_E1 and the second end LA_E2 of the antenna inductive circuit LA is located at a second side (i.e. the top side) of the inductor circuit 120, which is different from the bottom side. In other embodiments, all the ends of the three inductive circuits LA, LT, and LR can be disposed at the same side of the single chip die or can be disposed at different sides of the single chip die, e.g. the left or right side of the single chip die.

By integrating the transformer, balun circuit, and inductive components, the provided technical solution can provide better circuit balancing and better circuit/signal matching and can save more circuit areas. In addition, the wires of the inductive circuits at the primary side and secondary side of the transformer 120 in FIG. 1 and FIG. 5 can be implemented on the same metal layer and can be implemented by using a top layer such as a thick metal layer (but not limited) to decrease possible loss and obtain a better quality factor. Further, the transformer 120 as shown in FIG. 1 and FIG. 5 can be suitable for and applied into a variety of applications, and for example it can be applied into a structure of a multi-power selection power amplifier at the transmitter circuit 115, a structure of the Doherty power amplifier, a structure of a Gm-boosted CG low noise amplifier at the receiver circuit 110, a structure of source inductive-degenerated low noise amplifier, and so on.

Further, in the embodiment, the signal reception operation is not overlapped with the signal transmission operation, and an inductive wire coil such as the inductive circuit LT can be partially coupled to the signal ports of a transmitter circuit as well as can be partially coupled to the signal ports of a receiver circuit, so that the inductive wire coil can be shared to and respectively used by the transmitter circuit and receiver circuit, to implement different circuit structures of different receiver types and/or to meet different requirements of the different transmitters.

Further, in one embodiment, an inductive wire coil such as the inductive circuit LR can be changed to be used as an inductive wire coil at a transmitter side, i.e. a role of transmitter inductive circuit, to be coupled to a transmitter circuit and disconnected from a receiver circuit.

FIG. 6 is a diagram of a wireless communication device 600 according to an embodiment of the invention. The wireless communication device 600 comprises the antenna circuit 105, a receiver circuit 610, a transmitter circuit 615, and the inductor circuit 120. The transmitter circuit 615 for example in the signal transmission mode is arranged to generate and output a set of differential transmission signals through the signal ports S3 and S4 into the antenna circuit 105 via the inductor circuit 120. The receiver circuit 610 in the signal reception mode is arranged to receive another set of differential reception signals through the signal ports R1, R2, R3, and R4. In this embodiment, the signal transmission mode and the signal reception mode are performed respectively during different time periods/slots. The operations and functions of inductor circuit 120 and antenna circuit 105 in FIG. 6 are similar to those of inductor circuit 120 and antenna circuit 105 in FIG. 1 , and are not detailed for brevity; the turns ratios (or the numbers of turns) are also respectively shown on FIG. 6 .

Compared to the embodiment of FIG. 1 , as shown in FIG. 6 , the receiver circuit 610 has four input/signal ports R1-R4 and ground node P4. The first signal port R1 is coupled to the first end LR_E1 of the receiver inductive circuit LR, the second signal port R2 is coupled to the second end LR_E2 of the receiver inductive circuit LR, the ground node P4 is coupled to the center terminal/end LR_C of the wire coil of the receiver inductive circuit LR, the third signal port R3 is coupled to the first end LT_E1 of the transmitter inductive circuit LT, and the fourth signal port R4 is coupled to the second end LT_E2 of the transmitter inductive circuit LT.

The transmitter circuit 615 has two output/signal ports S3 and S4 and the ground node P3. The signal port S3 is coupled to the first intermediate terminal LT_E3 of transmitter inductive circuit LT, the signal port S4 is coupled to the second intermediate terminal LT_E4 of transmitter inductive circuit LT, and the ground node P3 is coupled to the center terminal/end LT_C of the wire coil of the transmitter inductive circuit LT. In this embodiment, the first end LT_E1 and the second end LT_E2 of the transmitter inductive circuit LT are respectively coupled to the receiver circuit 110, without being respectively coupled to the transmitter circuit 115. The wire coil of transmitter inductive circuit LT is shared to the transmitter circuit 115 and receiver circuit 110, and can be respectively used by the signal transmission operation/mode of the transmitter circuit 115 and the signal reception operation/mode of the receiver circuit 110 at different time periods/slots.

FIG. 7 is a diagram of an example of the inductor circuit (i.e. transformer) 120 when being applied into a structure of a Gm-boosted common gate low noise amplifier (CG LNA) at the receiver circuit 610 of FIG. 6 according to an embodiment of the invention. As shown in FIG. 7 , the receiver inductive circuit LR is used by the common gate LNA 701 of the receiver circuit 610 in FIG. 6 to provide better impedance matching, the LNA 701 at least comprises two transistors m1 and m2 which are used to form a common gate structure of a differential pair circuit in which the receiver inductive circuit LR is coupled between the gates of the transistors m1 and m2, the end LR_E1 is coupled to the gate (i.e. input port R1 shown in FIG. 6 ) of transistor m2, the end LR_E2 is coupled to the gate (i.e. input port R2 shown in FIG. 6 ) of transistor m1, the source (i.e. input port R4 shown in FIG. 6 ) of transistor m2 is coupled to the end LT_E2 of transmitter inductive circuit LT, the source (i.e. input port R3 shown in FIG. 6 ) of transistor m1 is coupled to the end LT_E1 of transmitter inductive circuit LT. The intermediate terminals LT_E3 and LT_E4 are respectively coupled to at least one differential signal output pair (i.e. signal ports S3 and S4 shown in FIG. 6 ) of at least one power amplifier (PA) 702 comprised by the transistor circuit 615 in FIG. 6 . The turns ratios (or the numbers of turns) are also respectively shown on FIG. 7 . It should be noted that the inductive circuit LR, the transmitter inductive circuit LT, and the antenna inductive circuit LA in FIG. 7 can be still disposed within a single chip die.

FIG. 8 is a diagram of an example of the inductor circuit (i.e. transformer) 120 when being applied into a structure of a source inductive-degenerated low noise amplifier (LNA) at the receiver circuit 610 of FIG. 6 according to an embodiment of the invention. As shown in FIG. 8 , the receiver inductive circuit LR is used by the source inductive-degenerated LNA 801 of the receiver circuit 610 in FIG. 6 to significantly improve the gain value, the LNA 801 at least comprises two transistors m3 and m4 which are formed to a differential pair circuit. The receiver inductive circuit LR is coupled between the sources of the transistors m3 and m4, the end LR_E1 is coupled to the source (i.e. input port R1 shown in FIG. 6 ) of transistor m4, the end LR_E2 is coupled to the source (i.e. input port R2 shown in FIG. 6 ) of transistor m3, the gate (i.e. input port R4 shown in FIG. 6 ) of transistor m4 is coupled to the end LT_E2 of transmitter inductive circuit LT, the gate (i.e. input port R3 shown in FIG. 6 ) of transistor m3 is coupled to the end LT_E1 of transmitter inductive circuit LT. The intermediate terminals LT_E3 and LT_E4 are respectively coupled to at least one differential signal output pair (i.e. signal ports S3 and S4 shown in FIG. 6 ) of at least one power amplifier (PA) 702 comprised by the transistor circuit 615 in FIG. 6 . The turns ratios (or the numbers of turns) are also respectively shown on FIG. 8 . It should be noted that the inductive circuit LR, the transmitter inductive circuit LT, and the antenna inductive circuit LA in FIG. 8 can be still disposed within a single chip die.

Further, in other embodiments, the inductive circuit LR can be coupled to and used by a transmitter circuit and is disconnected from a receiver circuit, i.e. the inductive circuit LR of inductor circuit 120 can be also used as a role of a transmitter inductive circuit. The inductive circuit LT can be shared to and respectively used by the transmitter circuit and the receiver circuit. FIG. 9 is a diagram of a wireless communication device 900 according to an embodiment of the invention. The wireless communication device 900 comprises the antenna circuit 105, the receiver circuit 110, a transmitter circuit 915, and the inductor circuit 120. The transmitter circuit 915 for example in the signal transmission mode is arranged to generate and output at least one set of differential output/transmission signals into the inductor circuit 120, and the receiver circuit 110 in the signal reception mode is arranged to receive one set of differential input/reception signals. In this embodiment, the signal transmission mode and the signal reception mode are performed respectively during different time periods/slots. The operations and functions of inductor circuit 120 and antenna circuit 105 in FIG. 9 are similar to those of inductor circuit 120 and antenna circuit 105 in FIG. 1 , and are not detailed for brevity; the turns ratios (or the numbers of turns) are also respectively shown on FIG. 9 .

Compared to the embodiment of FIG. 1 , as shown in FIG. 9 , the receiver circuit 110 has two input/signal ports R1-R2 and ground node P4. The first signal port R1 is coupled to the end LT_E4 of the inductive circuit LT, the second signal port R2 is coupled to the end LT_E1 of the inductive circuit LT, and the ground node P4 is for example (but not limited) coupled to the center terminal/end LT_C of the wire coil of the inductive circuit LT. The transmitter circuit 915 has four two output/signal ports S3, S4, S5, and S6, and two ground nodes P3 and P5. The signal port S3 is coupled to the first intermediate terminal LT_E3 of transmitter inductive circuit LT, the signal port S4 is coupled to the second intermediate terminal LT_E4 of transmitter inductive circuit LT, the ground node P3 is coupled to the center terminal/end LT_C of the wire coil of the transmitter inductive circuit LT, the signal port S5 is coupled to the first end LR_E1 of the inductive circuit LR, the signal port S6 is coupled to the second end LR_E2 of the inductive circuit LR, and the ground node P5 is coupled to the center terminal/end LR_C of the wire coil of the inductive circuit LR.

In this embodiment, the transmitter circuit 915 can provide and employ two different transmission paths in which a first transmission path is coupled to the inductive circuit LT through the signal ports S3 and S4, a second transmission path is coupled to the inductive circuit LR through the signal ports S5 and S6, and the two different transmission paths may be used to provide different transmission powers for different transmission signals outputted to the antenna circuit 105 or may be used as a man transmission path and an auxiliary transmission path for different transmission signals outputted to the antenna circuit 105.

FIG. 10 is a diagram of an example of the inductor circuit (i.e. transformer) 120 when being applied into a structure of multi-power selection power amplifiers in the transmitter circuit 915 of FIG. 9 according to an embodiment of the invention. As shown in FIG. 10 , the ends LT_E1 and LT_E2 of the inductive circuit LT are respectively coupled to the differential pair inputs of the LNA 1101 comprised by the receiver circuit 110 through the signal ports R1 and R2, and thus the differential reception signals RX1 and RX2 can be received and generated by the receiver circuit 110 through the antenna 105 and the inductor circuit 120.

For signal transmission, the intermediate terminals/ends LT_E3 and LT_E4 of the inductive circuit LT are respectively coupled to the differential pair outputs of the PA 9151 comprised by the transmitter circuit 915 through the signal ports S3 and S4, and thus one set of the differential transmission signals TX3 and TX4 can be transmitted outputted through the PA 9151, the inductor circuit 120, and the antenna 105 according to a first transmission power level such as a low power level (e.g. 0, 4, or 8 dBm (decibel-milliwatts)). That is, the PA 9151 in this example operates according to the low power level; however, this is not intended to be a limitation. The ends LR_E1 and LR_E2 of the inductive circuit LR are respectively coupled to another set of differential pair outputs of another PA 9152 comprised by the transmitter circuit 915 through the signal ports S5 and S6, and thus another set of the differential transmission signals TX5 and TX6 can be transmitted outputted through the PA 9152, the inductor circuit 120, and the antenna 105 according to a second transmission power level such as a high power level (e.g. 10 or 12 dBm). That is, the PA 9152 in this example operates according to the high power level; however, this is not intended to be a limitation. In practice, the numbers of turns N2 and N4 in FIG. 10 can be adjusted to implement the different transmission paths with different transmission power levels according to an identical supply voltage level. By doing so, the transmitter circuit 915 can select one of the different power transmission paths having different transmission powers to transmit a set of differential transmission signals or can select the two different power transmission paths to transmit two sets of differential transmission signals.

FIG. 11 is a diagram of an example of the inductor circuit (i.e. transformer) 120 when being applied into a structure of Doherty power amplifier scheme in the transmitter circuit 915 of FIG. 9 according to an embodiment of the invention. As shown in FIG. 11 , the ends LT_E1 and LT_E2 of the inductive circuit LT are respectively coupled to the differential pair inputs of the LNA 1101 comprised by the receiver circuit 110 through the signal ports R1 and R2, and thus the differential reception signals RX1 and RX2 can be received and generated by the receiver circuit 110 through the antenna 105 and the inductor circuit 120.

For signal transmission, the intermediate terminals/ends LT_E3 and LT_E4 of the inductive circuit LT are respectively coupled to the differential pair outputs of the PA 9151 comprised by the transmitter circuit 915 through the signal ports S3 and S4, and thus the differential transmission signals TX3 and TX4 can be transmitted outputted through the PA 9151, the inductor circuit 120, and the antenna 105 according to a first transmission path such as a main transmission path in which the PA 9151 is a class-AB power amplifier (i.e. a combination of class-A power amplifier and class-B power amplifier); however, this is not intended to be a limitation.

The ends LR_E1 and LR_E2 of the inductive circuit LR are respectively coupled to another set of differential pair outputs of another PA 9152 comprised by the transmitter circuit 915 through the signal ports S5 and S6, and thus the differential transmission signals TX5 and TX6 can be transmitted and outputted through the PA 9152, the inductor circuit 120, and the antenna 105 according to a second transmission path such as an auxiliary transmission path in which the PA 9151 is a class-C power amplifier. By doing so, the transmitter circuit 915 can select one of the different power transmission paths having different power amplifier types to transmit a set of differential transmission signals or can select the two different power transmission paths to transmit two sets of differential transmission signals. In FIG. 11 , the main transmission path can be used to make the transmission power of the transmitter circuit 915 be raise higher as well as the auxiliary transmission path can be used to improve the efficiency of the transmitter circuit 915.

Further, in other embodiments, the inductor circuit 120 can be applied into a structure of a Gm-boosted common gate low noise amplifier (CG LNA) at a receiver circuit as shown in FIG. 7 with a multi-power selection power amplifier at a transmitter circuit 115 as shown in FIG. 10 . Also, the inductor circuit 120 can be applied into a structure of a Gm-boosted common gate low noise amplifier at a receiver circuit as shown in FIG. 7 with a Doherty power amplifier structure in a transmitter circuit as shown in FIG. 11 . Also, the inductor circuit 120 can be applied into a structure of a source inductive-degenerated low noise amplifier at a receiver circuit as shown in FIG. 8 with a multi-power selection power amplifier at a transmitter circuit 115 as shown in FIG. 10 . Also, the inductor circuit 120 can be applied into a structure of a source inductive-degenerated low noise amplifier at a receiver circuit as shown in FIG. 8 with a Doherty power amplifier structure in a transmitter circuit as shown in FIG. 11 . All the modifications obey the spirits of the invention.

Those skilled in the art will readily observe that numerous modifications and alterations of the device and method may be made while retaining the teachings of the invention. Accordingly, the above disclosure should be construed as limited only by the metes and bounds of the appended claims. 

What is claimed is:
 1. An inductor circuit, comprising: a receiver inductive circuit; a transmitter inductive circuit, being respectively coupled to and used by a transmitter circuit and a receiver circuit during different time periods; and an antenna inductive circuit, having a first end coupled to a first signal port of an antenna circuit and a second end coupled to a second signal port of the antenna circuit; wherein the receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane; and, a circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.
 2. The inductor circuit of claim 1, wherein the transmitter inductive circuit comprises a first end coupled to the receiver circuit, a second end coupled to the receiver circuit, a first intermediate terminal coupled to a first output port of the transmitter circuit, and a second intermediate terminal coupled to a second output port of the transmitter circuit.
 3. The inductor circuit of claim 2, wherein the receiver inductive circuit comprises a first end coupled to a first input port of the receiver circuit and a second end coupled to a second input port of the receiver; and, the first end of the transmitter inductive circuit is coupled to a third input port of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a fourth input port of the receiver circuit.
 4. The inductor circuit of claim 3, wherein the second end of the receiver inductive circuit is coupled to a gate terminal of a first transistor of a low noise amplifier of the receiver circuit, the first end of the receiver inductive circuit is coupled to a gate terminal of a second transistor of the low noise amplifier of the receiver circuit, the first end of the transmitter inductive circuit is coupled to a source terminal of the first transistor of the low noise amplifier of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a source terminal of the second transistor of the low noise amplifier of the receiver circuit; and, the first transistor and the second transistor of the low noise amplifier of the receiver circuit are formed to a differential pair circuit.
 5. The inductor circuit of claim 4, wherein the first intermediate terminal of the transmitter inductive circuit is coupled to a first differential output port of a power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to a second differential output port of the power amplifier of the transmitter circuit.
 6. The inductor circuit of claim 3, wherein the second end of the receiver inductive circuit is coupled to a source terminal of a first transistor of a low noise amplifier of the receiver circuit, the first end of the receiver inductive circuit is coupled to a source terminal of a second transistor of the low noise amplifier of the receiver circuit, the first end of the transmitter inductive circuit is coupled to a gate terminal of the first transistor of the low noise amplifier of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a gate terminal of the second transistor of the low noise amplifier of the receiver circuit; and, the first transistor and the second transistor of the low noise amplifier of the receiver circuit are formed to a differential pair circuit.
 7. The inductor circuit of claim 6, wherein the first intermediate terminal of the transmitter inductive circuit is coupled to a first differential output port of a power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to a second differential output port of the power amplifier of the transmitter circuit.
 8. The inductor circuit of claim 2, wherein the receiver inductive circuit is used as another transmitter inductive circuit and comprises a first end coupled to a third output port of the transmitter circuit, a second end coupled to a fourth output port of the transmitter circuit, and a center terminal of the receiver inductive circuit is coupled to a ground node of the transmitter circuit.
 9. The inductor circuit of claim 8, wherein the first end of the transmitter inductive circuit is coupled to a first differential input port of a low noise amplifier of the receiver circuit, the second end of the transmitter inductive circuit is coupled to a second differential input port of the low noise amplifier of the receiver circuit, the first intermediate terminal of the transmitter inductive circuit is coupled to a differential output port of a first power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to another differential output port of the first power amplifier of the transmitter circuit; the first end of the receiver inductive circuit is coupled to a differential output port of a second power amplifier of the transmitter circuit, and the second end of the receiver inductive circuit is coupled to another differential output port of the second power amplifier of the transmitter circuit; and, the first power amplifier operates according to a first power level and the second power amplifier operates according to a second power level which is higher than the first power level.
 10. The inductor circuit of claim 8, wherein the first end of the transmitter inductive circuit is coupled to a first differential input port of a low noise amplifier of the receiver circuit, the second end of the transmitter inductive circuit is coupled to a second differential input port of the low noise amplifier of the receiver circuit, the first intermediate terminal of the transmitter inductive circuit is coupled to a differential output port of a first power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to another differential output port of the first power amplifier of the transmitter circuit; the first end of the receiver inductive circuit is coupled to a differential output port of a second power amplifier of the transmitter circuit, and the second end of the receiver inductive circuit is coupled to another differential output port of the second power amplifier of the transmitter circuit; and, the first power amplifier is a class-AB power amplifier, and the second power amplifier is a class-C power amplifier.
 11. A wireless communication device, comprising: a receiver circuit; a transmitter circuit; and an inductor circuit, comprising: a receiver inductive circuit; a transmitter inductive circuit, being respectively coupled to and used by the transmitter circuit and the receiver circuit during different time periods; and an antenna inductive circuit, having a first end coupled to a first signal port of an antenna circuit and a second end coupled to a second signal port of the antenna circuit; wherein the receiver inductive circuit is disposed on a specific ring of a specific plane to form a ring shape; the transmitter inductive circuit and the antenna inductive circuit are disposed inside the specific ring and surrounded by the specific ring of the specific plane; and, a circuit area, occupied by the transmitter inductive circuit, inside the specific ring and on the specific plane, is larger than a circuit area occupied by the receiver inductive circuit and by the antenna inductive circuit.
 12. The wireless communication device of claim 11, wherein the transmitter inductive circuit comprises a first end coupled to the receiver circuit, a second end coupled to the receiver circuit, a first intermediate terminal coupled to a first output port of the transmitter circuit, and a second intermediate terminal coupled to a second output port of the transmitter circuit.
 13. The wireless communication device of claim 12, wherein the receiver inductive circuit comprises a first end coupled to a first input port of the receiver circuit and a second end coupled to a second input port of the receiver; and, the first end of the transmitter inductive circuit is coupled to a third input port of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a fourth input port of the receiver circuit.
 14. The wireless communication device of claim 13, wherein the second end of the receiver inductive circuit is coupled to a gate terminal of a first transistor of a low noise amplifier of the receiver circuit, the first end of the receiver inductive circuit is coupled to a gate terminal of a second transistor of the low noise amplifier of the receiver circuit, the first end of the transmitter inductive circuit is coupled to a source terminal of the first transistor of the low noise amplifier of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a source terminal of the second transistor of the low noise amplifier of the receiver circuit; and, the first transistor and the second transistor of the low noise amplifier of the receiver circuit are formed to a differential pair circuit.
 15. The wireless communication device of claim 14, wherein the first intermediate terminal of the transmitter inductive circuit is coupled to a first differential output port of a power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to a second differential output port of the power amplifier of the transmitter circuit.
 16. The wireless communication device of claim 13, wherein the second end of the receiver inductive circuit is coupled to a source terminal of a first transistor of a low noise amplifier of the receiver circuit, the first end of the receiver inductive circuit is coupled to a source terminal of a second transistor of the low noise amplifier of the receiver circuit, the first end of the transmitter inductive circuit is coupled to a gate terminal of the first transistor of the low noise amplifier of the receiver circuit, and the second end of the transmitter inductive circuit is coupled to a gate terminal of the second transistor of the low noise amplifier of the receiver circuit; and, the first transistor and the second transistor of the low noise amplifier of the receiver circuit are formed to a differential pair circuit.
 17. The wireless communication device of claim 16, wherein the first intermediate terminal of the transmitter inductive circuit is coupled to a first differential output port of a power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to a second differential output port of the power amplifier of the transmitter circuit.
 18. The wireless communication device of claim 12, wherein the receiver inductive circuit is used as another transmitter inductive circuit and comprises a first end coupled to a third output port of the transmitter circuit, a second end coupled to a fourth output port of the transmitter circuit, and a center terminal of the receiver inductive circuit is coupled to a ground node of the transmitter circuit.
 19. The wireless communication device of claim 18, wherein the first end of the transmitter inductive circuit is coupled to a first differential input port of a low noise amplifier of the receiver circuit, the second end of the transmitter inductive circuit is coupled to a second differential input port of the low noise amplifier of the receiver circuit, the first intermediate terminal of the transmitter inductive circuit is coupled to a differential output port of a first power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to another differential output port of the first power amplifier of the transmitter circuit; the first end of the receiver inductive circuit is coupled to a differential output port of a second power amplifier of the transmitter circuit, and the second end of the receiver inductive circuit is coupled to another differential output port of the second power amplifier of the transmitter circuit; and, the first power amplifier operates according to a first power level and the second power amplifier operates according to a second power level which is higher than the first power level.
 20. The wireless communication device of claim 18, wherein the first end of the transmitter inductive circuit is coupled to a first differential input port of a low noise amplifier of the receiver circuit, the second end of the transmitter inductive circuit is coupled to a second differential input port of the low noise amplifier of the receiver circuit, the first intermediate terminal of the transmitter inductive circuit is coupled to a differential output port of a first power amplifier of the transmitter circuit, and the second intermediate terminal of the transmitter inductive circuit is coupled to another differential output port of the first power amplifier of the transmitter circuit; the first end of the receiver inductive circuit is coupled to a differential output port of a second power amplifier of the transmitter circuit, and the second end of the receiver inductive circuit is coupled to another differential output port of the second power amplifier of the transmitter circuit; and, the first power amplifier is a class-AB power amplifier, and the second power amplifier is a class-C power amplifier. 